Fig. A.1
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Periodograms of the time series of the FWHM, BIS, and H-alpha index for the four targets of this work: HD 87816 (panel a), HD 94890 (panel b), HD 102888 (panel c), and HD 121056 (panel d). The horizontal lines show the different FAP levels: 1% (dashed orange line) and 0.1% (dashed-dotted blue line). The vertical red lines indicate the orbital periods of the detected exoplanets around each star.
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